Calipers.



RYB. ELLIS.

GALIPERS. APPLIOATION FILED N0v.1n,1912.

l, l @2, 146, s v Patented June 30,1914.

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EMORY E. ELLIS, OF ORANGE, MASSACHUSETTS, ASSIGNDB T0 Ull'lflilfl CLIPEBi CMPANY, 0F ORANGE, MASSAGHUSE'III.

CALIPERS.

Specification of Letters Patent.

yatented June 3 0, 1914 Application tiled November 18, 1912. 'Serial No. 731,989.

good r'esultsupon dividers and similarin slrumeuts ot precision. Y

Among calipers, as at present constructed, much di'fiiculty has been found in using the calipers accurately upon an irregular suri'accd object, such as a flanged hub or the like, where it is necessary to spring the legs of the calipers over the flange to enable the calipers7 points to engage the hub to determine its dimension.

The resetting ci? the points, after their expansion to pass an obstruction or their contraction to pass through a small opening, is as important the initial calipering, hence the necessity of calipers which can be quickly set and reset. The present invention, therefore has for its object to provide calipers which will possess all the merits of the old style of calipers without being subject to the defects as noted above, and which may be used advantageously, either as inside or out side calipers, upon objects of an irregular nature to secure their correct measurement. In the accompanying drawing, in which similar numerals of reference denote correspondinpr parts in the several views thereof, l' have illustrated a practical embodiment of my invention, in which:

Figure 1 a 'front view of a pair of calipers, and Fig. 2 is a section thereof on line 2---2 of Fig, l.

Referring more particularly to thc draw ing, the numerals 3 and 4 denote a pair of calipers legs, of any desired proportions ,or form, pivoted near their upper extremlties on a fulcrum stud 5, and adapted for control by the compression bow spring 6. (lne legr .3 of the calipers is provided at a suitable point with a transverse guide, or stop 7, so positioned as to limit the upward movement of the horizontal adjusting rod 8. This rod has an elongated slot 9 in which the calipers legs work. `Said slot divides the rod8 into two spaced, parallel arms 10, suitably connected 'attheir `outer ends, exteriorly of the legs. Each arm hasalong its lower face a'plurality of notches-11141 adapted i `*for selective .'engogementf with il a looking;y pin 12`passing transversely throu h theleg3 of the calipers;belowI the guide and t stoppin 7. The rou lrfadj-ustment of the calipers-may thuslbe i 'adrby springing the legs.` over the object to be measured b exert- -inga pressure.Y upon-.one ornbeth .ofi lie legs; This will cause a movement of the adjusting rod relative to the legs and will ermitthe notches of said rod to engage tile locking pin 12 on the leg 3, the stop pin 7 serving to limit the upward movement of said rodi The arms V10 are each formed with an elongated slot 13 in which ts a. pi i 14, passing through the leg 4 ofthe calipers and serving as a pivot for the adjust-mglrod. This slot and pin connection permits a slight vertical and horizontal play of the adjusting rod 8.

The fine adjustment of the calipers ishad through the elongated slot 13 andfpin 14 which permit a movement of theadjust-ing rod roportionate to tthe length of the threaded adjusting screw 15, turned" by a milled nut 16 and passing through one pf the connecting end members of said` pair of arms 10.

The appliance is used in the well -lmown manner, the rough adjustment being made by drawing the legs toward each other).` and engaging a pair of otches over the locking ing the set screw arid thus moving the rod.

In the event that the object to be measured is an irregular surface, such as a Atlan red hub, for example, over which flange the legs must pass to en 'ge the hub, the adjustment `may be had 'y extending the legs to their maximum capacity to c ear the flange and then the may be brought together over the hu and the dimension measured, the relation of the lockin pin and cooperating notches indicating t e `;di

pin. The tine adju ment is'made by rotat ameter. These notches may be numbered or i graduated in any suitable manner if'desire'd and when the measurement has been taken,

the notches and pim are disengaged,and the erating notches, the position, or distinctive number of 'each having been taken When the measuremert Was made, thus determining the dimension desired, `this construction permitting the accurate resetting of the cali,- pers lto the exact hub dimension.

Various modifications coming Within the spirit and scope of my invention, .as deiined in the appended claims, may be resorted to whenever necessary.

I claim:

1. In a pair of calipers, caliper legs, a

` locking member on one of said legs, .an ad justable member slotted to provide spaced arms, said arms being notched for engagement over said locking member, a sto for limiting .the upward movement of sai adjustable member, the arms of said adjustable member having slots therein, a pin on one oit' said `caliper vleg's Working in said slots,

'riempie and a screw to adjst said adjustable member relative to one of the legs.

2. ln a pair of calipers, caliper legs and a locking member embracing said legs and Ahaving a combined pivotal'and sliding conto and having a selective locking engagement with the other leg.

In testimony whereof I aix my signature Ain presencev o two Witnesses.

EMORY E. ELLlS.V llitnesses HENRY A.. WHITE, F. A. KENT. 

